Make consistent the syscall stubs for the syscalls that got special

handling to fix up the alignment of 64bit arguments so that they do
the same dance where _thread_sys_FOO is the real stub and FOO is a
weak alias.  For some of them, this is needed for cancellation handling.

From discussions with fgsch@, ok millert@

1 files changed, 16 insertions, 1 deletions

diff --git a/src/lib/libc/include/thread_private.h b/src/lib/libc/include/thread_private.h
index 2d8913e482..673fb9c6a6 100644
--- a/src/lib/libc/include/thread_private.h
+++ b/src/lib/libc/include/thread_private.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: thread_private.h,v 1.24 2008/06/14 15:43:43 otto Exp $ */
+/* $OpenBSD: thread_private.h,v 1.25 2011/10/16 06:29:56 guenther Exp $ */
 
 /* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
 
@@ -34,6 +34,21 @@ extern int __isthreaded;
 #endif
 
 /*
+ * Ditto for hand-written syscall stubs:
+ * 
+ * Use STUB_NAME(n) to get the strong name of the stub: _thread_sys_n
+ *     STUB_ALIAS(n) to generate the weak symbol n pointing to _thread_sys_n,
+ *     STUB_PROTOTYPE(n) to generate a prototype for _thread_sys_n (based on n).
+ */
+#define STUB_NAME(name)         __CONCAT(_thread_sys_,name)
+#define STUB_ALIAS(name)        __weak_alias(name, STUB_NAME(name))
+#ifdef __GNUC__
+#define STUB_PROTOTYPE(name)    __typeof__(name) STUB_NAME(name)
+#else
+#define STUB_PROTOTYPE(name)    /* typeof() only in gcc */
+#endif
+
+/*
  * helper macro to make unique names in the thread namespace
  */
 #define __THREAD_NAME(name)     __CONCAT(_thread_tagname_,name)